Temperature during the hottest quarter 0.479131 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.58314 Nitrogen content of soil 0.614202 Day/night diurnal temperature difference 0.655558 Compound topographic index (relative wetness) 0.659021 Elevation 0.819165 Precipitation during the driest quarter 0.823934 Precipitation during the wettest quarter 0.85824 Carbon content of soil 1.23304 Precipitation during the coldest quarter 1.29381 Precipitation during the hottest quarter 1.30181 Available water holding capacity of soil 1.31312 Ratio of precipitation to potential evapotranspiration 1.54182 Solar interception 1.87206 Bulk density of soil 2.29469 Sum of monthly Tavg where Tavg >=5 deg C 2.37854 Temperature during the coldest quarter 3.50818